This feels much more satisfying and well-tuned than the original Sanctum - and the addition of co-op takes it to a whole new difficulty level.

The combination of tower defense and hack-n-slash works fairly well together, though the classes are completely unbalanced. Melee is by far the easiest.

Orcs Must Die! [Steam store page]
While not co-op like the sequel, this game has an excellent sense of humor and decently balanced maps. Too bad the humor didn't carry over to Orcs Must Die! 2

Orcs Must Die! 2 [Steam store page]
They added co-op, but lost some of the humor that made Orcs Must Die! so fun. Similar gameplay, with more expansive levels to challenge two players.

Saints Row IV [Steam store page]
While Saints Row: The Third was fun madness, this sequel adds a superhero twist with great new abilities and much easier travel than the previous game.

APB Reloaded [Steam store page]
Third-person shooter MMO with odd aiming and repetitive missions. The teams are often completely unbalanced and the mission goals sometimes are as well. Turtling many times wins the match.

Beat Hazard [Steam store page]
An interesting mix of music and gaming - enemies generated by songs. Disappointing that they charge extra for multiplayer (DLC - BH Ultra).

Bunch of Heroes [Steam store page]
The survival mode is fun co-op but it has huge flaws - can't join mid-game, and people who disconnect can't rejoin. You also can't heal - have to suicide while your friends kite. There's also a huge disparity in the usefulness of the guns.

Trine 2: Complete Story [Steam store page]
I didn't enjoy this nearly as much as Trine - it felt like less of a puzzle game and a lot more platformer. The wizard's triangle is gone, and all the characters swim the same now.

PAYDAY The Heist [Steam store page]
A fun co-op experience. The latest AI patch made it much easier to play without all four players being human. Enemy AI still has nearly perfect aim, but the body armor balances nicely if you use cover. You earn new guns and upgrades as you play.

The casting system is reasonably intuitive, and the gameplay itself is as fun as Torchlight, though the heavy corridor feel of the levels detracts a bit. There is a smattering of story and humor throughout, but I wouldn't call it story-driven.

Dead Space 2 [Steam store page]
Much better and scarier than Dead Space, good atmosphere. The camera isn't sluggish and not as close. Combat also seems more responsive, and melee is somewhat possible. The 'Force' is useful, though sometimes the item you're holding disappears.

Left 4 Dead 2 [Steam store page]
Even though Killing Floor doesn't have a story line I still prefer it for co-op fun. This is incredibly easy, and the scripted way the special zombies pop out next to you is annoying unless you have the maps memorized.

Killing Floor [Steam store page]
The graphics are a bit rough but this game is all about speed and accuracy killing waves of experimental creatures. Forget story, the co-op is loads of fun with a group of friends, and fairly challenging as well.

The most difficult part is the way enemies rubberband - if you run full tilt on many maps, and turn around they'll still be very close behind you - rounding the nearest corner or doorway. The spawn locations also don't seem to be set specifically - they seem to appear directly around any corner that you haven't looked around in the last few seconds, or further ahead if you're running rather than camping. On some areas in maps they also drop down from above, off buildings or through holes in the roof.

These mechanics aren't necessarily flaws - they make the game much more fast paced and difficult than it would be if you could kite them more strategically. Kiting is still very much possible because the game limits the number of enemies on the map at any time - so if you can group them all behind you then they will slowly appear in front of you as you kill ones behind.

Expansive levels that make Portal look like a tech demo, with quite a few new fun mechanics and a lot of back-story about the Aperture Corporation. It's about three times as long as the original, and once again ends with fantastic music.

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